Bipolar Electrode Array for Impedimetric Cell Analysis
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Solution Overview
Problem
Current impedance sensing technologies for adherent cells on gold film electrodes face limitations such as high production costs, difficulty in simultaneous optical monitoring, neglect of low-frequency analysis due to noise, inadequate temperature control, and complex electroporation optimization, which hinder efficient and accurate impedance-based cell analysis and manipulation.
Innovation Solution
A bipolar electrode array with a transparent substrate and thin, high-inherent-resistance conductive film allows for simultaneous impedimetric and optical cell analysis, enabling temperature measurement and efficient electroporation optimization using a continuous potential gradient, compatible with inverted microscopy and reducing material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional gold film electrodes are used for impedance sensing, then electrical conductivity is ensured, but production costs increase and optical monitoring becomes difficult
Solution Approach 1:
The patent changes the material parameter from traditional gold film to transparent conducting oxides (TCO) such as ITO, IGZO, or ZnO. These materials provide sufficient electrical conductivity for impedance sensing while being transparent to visible light, enabling simultaneous optical monitoring. The TCO layer is deposited as a thin film (5-50 nm) on glass substrates, reducing material costs compared to gold while maintaining functional performance.
Solution Approach 2:
The patent employs composite material structures combining TCO layers with glass substrates and optional metal contact layers. This composite approach integrates the optical transparency of glass with the electrical conductivity of TCO, creating a multifunctional electrode that satisfies both electrical and optical requirements simultaneously.
2Reliability
If traditional opaque gold film electrodes are used, then electrical conductivity is maintained, but simultaneous optical monitoring becomes difficult
Solution Approach 1:
The patent changes the optical parameter by selecting TCO materials that are transparent in the visible spectrum. The thin film structure (5-50 nm) of TCO allows light transmission while maintaining adequate electrical conductivity for impedance measurements, thereby enabling simultaneous optical monitoring of cell cultures.
Solution Approach 2:
The TCO electrode serves multiple functions simultaneously: it acts as an electrical conductor for impedance sensing and as an optically transparent window for light transmission. This multi-functionality eliminates the need for separate optical components and enables combined electrical-optical cell analysis.
3Measurement precision
If low-frequency impedance analysis is performed with traditional electrodes, then complete frequency spectrum is obtained, but noise levels increase making measurements unreliable
Solution Approach 1:
The patent modifies the electrode's electrical parameters by using TCO materials with specific resistance characteristics. The thin film structure and material properties of TCO provide a balanced impedance that reduces low-frequency noise while maintaining adequate signal strength across the measurement frequency range, improving the reliability of low-frequency impedance measurements.
4Reliability
If thick gold film electrodes are used, then electrical conductivity is ensured, but optical transparency and material cost are compromised
Solution Approach 1:
The patent changes the material composition from gold to TCO and reduces the film thickness to 5-50 nm. This thin film structure provides sufficient electrical conductivity for impedance sensing while dramatically reducing material consumption and cost. The glass substrate compensates for the reduced conductivity by providing mechanical support and electrical isolation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables accurate, cost-effective, and efficient impedance analysis and cell manipulation by directly measuring temperature and optimizing electroporation parameters, while allowing for simultaneous optical examination and reducing production costs through thinner electrode films.
Implementation Method 1
The temperature dependence of the inherent resistance of these bipolar electrodes allows determining the temperature directly beneath the cell layer simultaneously during the impedance examination on the cells.
Implementation Method 2
enabling temperature measurement and efficient electroporation optimization using a continuous potential gradient
Implementation Method 3
The impedance between the cell-covered gold film electrode and a counter electrode is measured at one or more frequencies as a function of time.
Data Source
AI summary
The present disclosure relates to a measuring device with a bipolar electrode array for the impedimetric analysis of adherent cells according to the ECIS principle (electric cells substrate impedance sensing). The measuring device comprises an electrode array which is adapted for being wetted with an electrolyte solution and adherently growing cells in order to perform impedimetric cell analyzes, characterized in that the electrode array comprises a bipolar electrode on a substrate, where the bipolar electrode is formed as a conductive path on the transparent substrate and has an inherent resistance between two connection points of the conductive path that is a multiple of the AC impedance of the electrolyte solution at 1 MHz, measured at the two connection points.